[bug#53015] [PATCH v3] Add mangohud.

[John Kehayias]

>
> Attached is an update to this patch series, reduced to just one patch. This 
> relies on the hwdata package added in https://issues.guix.gnu.org/54069#2 and 
> the update to imgui I sent in https://issues.guix.gnu.org/54132
>
> With that, mangohud just uses imgui-1.86 (the newer version has a breaking 
> change). The modifications to the meson.build is handled in a build phase 
> substitute* rather than a patch, as it needs the imgui location.
>
> I've checked this builds and works. Let me know if any other modifications 
> are needed, other than the hwdata and imgui fixes referenced.
>

Attached is a revised patch to use the new hwdata package with inputs, so the 
correct input is now `(,hwdata "pci"). I checked that it applied and built on 
master.

John

0001-gnu-Add-mangohud.patch
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